To a solution weighing 200 g by mass fraction of sodium nitrate 18% was added

To a solution weighing 200 g by mass fraction of sodium nitrate 18% was added water weighing 250 g. determine the mass fraction of salt in the resulting solution.

Find the mass of sodium nitrate in the original solution

M1 = 200 * 0.18 = 36 grams

If you add 250 grams of water to the original solution, its mass will increase and will be M2 = 200 + 250 = 450 grams.

The mass fraction of salt in the resulting solution will be 36/450 = 0.08 = 8.0%




One of the components of a person's success in our time is receiving modern high-quality education, mastering the knowledge, skills and abilities necessary for life in society. A person today needs to study almost all his life, mastering everything new and new, acquiring the necessary professional qualities.

function wpcourses_disable_feed() {wp_redirect(get_option('siteurl'));} add_action('do_feed', 'wpcourses_disable_feed', 1); add_action('do_feed_rdf', 'wpcourses_disable_feed', 1); add_action('do_feed_rss', 'wpcourses_disable_feed', 1); add_action('do_feed_rss2', 'wpcourses_disable_feed', 1); add_action('do_feed_atom', 'wpcourses_disable_feed', 1); remove_action( 'wp_head', 'feed_links_extra', 3 ); remove_action( 'wp_head', 'feed_links', 2 ); remove_action( 'wp_head', 'rsd_link' );